<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		<form action="" method="post">
			<input type="email" name="text" placeholder="请输入用户名"required/>
			<input type="submit" value="提交"/>
		</form>
	</body>
</html>
